Are you sure you need a hard reset. The Note 9 is having issues where it says enter your pin and won't use your biometrics, but gets stuck in a loop back to the enter your pin screen. To clear this hold the power button until the 3 options appear on your screen. Then hold hold the power off button until enter safe mode appears. It will ask your pin and actually accept it then boot into safe mode. Once in safe mode you can restart to normal mode when the question appears and it will be working again.

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